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The crucial difference between time series analysis and regression test is the order in which data is worked upon. In time series analysis test, the data is a sequence which is taken within an event at equally spaced points in time. Whereas the regression analysis is the utilisation of present input values to one or more values and testing their impact on some other time series.

The difference between the two is that the time series is used to predict a value at a particular point of time during the day using previous values from that same point in time on previous days, where regression analysis is used to test theories about current values.

If you are not sure about the test and want to learn the basics of these tests then visit https://www.statisticssolutions.com/time-series-analysis/ and https://en.wikipedia.org/wiki/Regression_analysis